//C03:escape.c -- 使用转义序列.
#include <stdio.h>
int main(void)
{
    float salary;
    printf("\aEnter your desired monthly salary: ");
    printf("$____\b\b\b\b");
    scanf("%f",&salary);
    printf("\n\t$%.2f a month is $%.2f a year .", salary, salary * 12.0);
    printf("\rGee!\n");
}